使用iptable实现: 放行ssh,telnet, ftp, web服务80端口，其他端口服务全部拒绝()

使用iptable实现: 放行ssh,telnet, ftp, web服务80端口，其他端口服务全部拒绝

端口检查

需要放行端口
ssh:22
telnet:20,21
ftp:23
web:80,443
samba tcp:139,445
samba udp:137,138

操作过程

# 允许本机10.0.0.11访问ssh端口
[root@node1 ~]# iptables -I INPUT -s 10.0.0.11 -p tcp --dport 22 -j ACCEPT
# 允许已建立的链接通过(小心操作)
[root@node1 ~]# iptables -I INPUT -p tcp -m state --state ESTABLISHED,RELATED -j ACCEPT
#放行端口
[root@node1 ~]# iptables -A INPUT -p tcp -m multiport --dports 20,21,23,80,443,139,445 -j ACCEPT
[root@node1 ~]# iptables -A INPUT -p udp --dport 137:138 -j ACCEPT

#拒绝其他所有连接(小心操作)
[root@node1 ~]# iptables -A INPUT -j REJECT


# 查看防火墙规则
[root@node1 ~]# iptables -nvL
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target    prot opt in   out    source       destination       
   37  2268 ACCEPT    tcp  --  *    *     0.0.0.0/0    0.0.0.0/0    state RELATED,ESTABLISHED
    0     0 ACCEPT    tcp  --  *    *     10.0.0.11    0.0.0.0/0    tcp dpt:22
    0     0 ACCEPT    tcp  --  *    *     0.0.0.0/0    0.0.0.0/0    multiport dports 20,21,23,80,443,139,445
    0     0 ACCEPT    udp  --  *    *     0.0.0.0/0    0.0.0.0/0    udp dpts:137:138

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination
————————

使用iptable实现: 放行ssh,telnet, ftp, web服务80端口，其他端口服务全部拒绝

端口检查

需要放行端口
ssh:22
telnet:20,21
ftp:23
web:80,443
samba tcp:139,445
samba udp:137,138

操作过程

# 允许本机10.0.0.11访问ssh端口
[root@node1 ~]# iptables -I INPUT -s 10.0.0.11 -p tcp --dport 22 -j ACCEPT
# 允许已建立的链接通过(小心操作)
[root@node1 ~]# iptables -I INPUT -p tcp -m state --state ESTABLISHED,RELATED -j ACCEPT
#放行端口
[root@node1 ~]# iptables -A INPUT -p tcp -m multiport --dports 20,21,23,80,443,139,445 -j ACCEPT
[root@node1 ~]# iptables -A INPUT -p udp --dport 137:138 -j ACCEPT

#拒绝其他所有连接(小心操作)
[root@node1 ~]# iptables -A INPUT -j REJECT


# 查看防火墙规则
[root@node1 ~]# iptables -nvL
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target    prot opt in   out    source       destination       
   37  2268 ACCEPT    tcp  --  *    *     0.0.0.0/0    0.0.0.0/0    state RELATED,ESTABLISHED
    0     0 ACCEPT    tcp  --  *    *     10.0.0.11    0.0.0.0/0    tcp dpt:22
    0     0 ACCEPT    tcp  --  *    *     0.0.0.0/0    0.0.0.0/0    multiport dports 20,21,23,80,443,139,445
    0     0 ACCEPT    udp  --  *    *     0.0.0.0/0    0.0.0.0/0    udp dpts:137:138

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination